Tuning device



1. E. MoURoM'rsEr-F ET AL 2,263,184

INov. 18, 1941.'

TUNING DEVICE Filed Oct. 9, 1940 Mmm/1 ATTORNEY Ilia E. Mouromtsei,Montclair, and

ratti i George M.'

Dlnnick, Bloomfield, N. .1.,` assigner: to West' inghouse Electric &Manufacturing Company,

East Pittsburgh, Pa.,

Sylvania `a corporation of Penn- Application October 9, 1940, ASerialNo. 360,366 4 Claims. (01.250.275)

Our invention relates to ultra-high frequency apparatus, andv especiallyto apparatus incorporating hollow body resonators.

Recently high frequency generators have been developed in which hollowbody resonators are interposed in the path of the charges in a dischargedevice. In such resonators, the frequency is dependent on the dimensionsof the resonators and can be varied by changing the resonatordimensions.

For proper operation of the generator, the resonator must be tuned and,therefore, its dimensions must be varied.

It is one of the objects of our invention to provide tuning meanscapable of accurate adjustment for the resonator of a high frequencgenerator.

Another object of our invention is to provide the structure of a highfrequency generator so that the resonator may be easily and accuratelytuned.

' Other objects and advantages of the invention will be apparent fromthe following description and drawing in which: i

Figure 1 is a view, partly in elevation an partly in cross section of apreferred embodiment of our invention.

i Figure 2 is a top elevation of Figure 1.

In Figure 1 we have disclosed a preferred embodiment of our ultra-highfrequency generator, and special tuning means therefor. This ultrahighfrequency generator comprises two hollow body resonators I and II, withan intermediate field-free conductive shell I2. As illustrated, in

Figure 1, we preferably have the field-free tube constructed as a hollowmetal tube I2 supported at its mld-section by a circular plate I4 'thatforms an intermediate integral lateral extension of the shell or tube I5and also a. common boundary between the two hollow body resonators. u'

The hollow body resonator Ill is formed by a thin cup-shaped metal bodyI5 secured to the plate I4 at its flange I6. The hollow body II issecurely formed by a cup-shaped metal body I1, located on the other sideof the common `boundary plate I4, and having its flange I8 securedthereto.

The hollow tube I2 has its ends 20 and 2l closed by perforated metal endpieces. The adjacent portion 22 of the metal cup-shaped body has similarperforations 23 therein, corresponding with the perforations in the'endpiece 20. Likewise, the portion 24 of the hollow body I1 hasperforations 25 therein, to correspond with the intermediate hollowbody. The two. hollow bodies are coupled together, preferably by a metalring 26, extending. fromV one side of the lcommon boundary disk I4through an opening 21 to the other side of the disk I4.

The hollow cup-shaped body I5 preferably has an integral tubular flange28 surrounding the perforated portion 22. The outer portion of thistubular extension is preferably screw threaded at 25. Encloslng thisportion is another tubular body 3d with interior threads 3l to lit intothe threads 29. The exterior of this body is likewise screw threaded at32 to fit into circular nut 3ft that has outward extensions, which, asdisclosed, is in the form. of a triangle 34 with vertexes 85, 36 and 31extending beyond the vertical boundary of the hollow body resonator.These vertexes have bolts 38 extending therethrough, and these boltscontinue on to similar extensions 39, 40, 4I of flanges on thecup-shaped body I5, boundary plate I4 and cup-shaped body I1respectively of the hollow resonators.

The tubular extension 28 has its upper end 42 closed vacuum tight withinsulation 43, and through this insulation extension are leads 44 and 45to the filament 46 acting as a cathode for the discharge device. Ifdesired, a grid may also be inserted to control or concentrate the electron stream.

The bottom hollow resonator II likewise has a tubular extension 41 thatpreferably terminates' in a tapered closed end 48 forming an anode. Thistapered closed end 48 may have cooling coils 49 surrounding thisportion. In place of these cooling coils, the casing of the highfrequency generator may be cooled by a current of air, such as that froma fan.

The portion of this integral projection 41 may be screw threaded asindicated at 50, and enclosed with a tubular casing 5I, screw threadedinside and out, similar to the tubular member 30 at theother end of thecasing. This tubular member 5I has a. knurled flange 52 for adjustmenton the tubular member 50.

We also prefer to provide an additional tubular member 53 screwed aroundthe outside of the member 5I and screwed into a circular nut 54 withextensions 55 to be fastened to the rods 38 by nuts 56. We prefer tomake the threads 51 on the outer surface of the tubular member 53 in thereverse direction to those on the surfaces 50 and 5I; or, we may makethese threads in the same direction but of different pitch.

The output circuit comprises a loop in the the perforations in the lowerend piece 2| of 55 hollow body oscillator II secured to a tube 6I,

' ence of these pitches.

extending from this resonator and having the other end of the loopsecured to an axial conductor 62 of this tube to form the well-knownoutput transmission line for the oscillator. The transmission line maybe closed, if desired, by a protecting casing 63.

The distance 64 between the perforated opening 22 of the hollowresonator l0, and the perforated disk 20 of the field-free hollow tubel2, determines the frequency of oscillation of the resonator i0.Likewise the distance 65 between the perforated\d\isk 2| of thefield-free tube l2 and the perforatedgrid 25 of the hollow resonator Il,determines the frequency of oscillation of the hollow resonator I I.

These two distances 64 and 65 must be carefully adjusted for eflicienttuning of the resonators and for a higher output. In order to regulatethe distance 64 we adjust the tubular member -32 by its knurled flange32. The tubular member 32 is connected by its screw threads to the nut33 which is flxedly secured to the casing by the bolts 38. On the innerside, the tubular member 32 is screw threaded to the integral frontflange 28. The adjustment of 32 will force the tubular extension 28 upor down and this will adjust the position of the perforated opening 22in relationship to the perforated disk 20 of the field-free tube l2 byflexing the flat thin plate portion 22. A similar adjustment of thetubular member by its knurled flange 52 will likewise adjust thedistance 65 in the lower portion of the tube.

In order to obtain a finer adjustment, however, we have inserted theadditional tubular member 53 with reversed threads or with threads ofdifferent pitch on its inner and outer portion. The threads may haveslightly different pitches so that one complete turn will displace thewall of the hollow resonator Il by the sum or differ- The inner pitchmay be, for instance, fourteen threads to the inch, and the outertwenty-four threads to the inch. This difference in pitch or direction,or both, may be made on one cylindrical member such as 5i instead ofproviding the additional member 53. In such a case the threads on theinner nut 54. would correspond with threads on the outer wall of 5I andllt into them.

After the adjustment has been obtained, the adjustment can be locked byany suitable means, such as by the screw 66 extending through the flange52 of the tubular member 5| and bearing against the flange 51 of thetubular member 51.

We have, accordingly, disclosed very accurate tuning means fordisplacing an integral flexible wall of a hollow body resonator. It isapparent, of course, that many modifications may be made in thepreferred embodiment illustrated, and accordingly we desire only suchlimitations to be imposed on the invention as are necessitated by thespirit and scope of the following claims.

We claim:

l. An ultra-high frequency discharge' device comprising a hollowconductive shell having a perforated end, said shell having an extensionlateral to said perforated end; a cup-shaped member enclosing theperforated end of said conductive shell and having its edge secured tothe said lateral extension of said shell, the bottom portion of thecup-shaped member being flat,

flexible and having a perforated portion adjacent the perforated end ofthe hollow conductive shell, an integrally secured circular flangesurrounding the perforated portion of said cup-shaped member andextending outwardly, insulation closing the end of said circular flange,a cathode within said circular flange, said circular flange havingexterior screw threads, an adjusting member screwed on said threads andhaving threads on its exterior, a supporting member receiving saidexterior threads on said adjusting member, said supporting member beingsecured to the said lateral extension of said shell.

2. An ultra-high frequency discharge device comprising a hollow tubeconductive shell having a perforated end, said shell having an extensionlateral to said perforated end; a cup-shaped member enclosing theperforated end of said conductive shell and having its edge secured tothe said lateral extension of said shell, the bottom portion of thecup-shaped member being flat, flexible and having a perforated portionadjacent the perforated end of the hollow conductive shell, anintegrally secured circular flange surrounding the perforated portion ofsaid cup-shaped member and extending outwardly, insulation closing theend of said circular flange, a, cathode within said circular flange,said circular flange having exterior screw threads, an adjusting memberscrewed on said threads and having threads on its exterior, a supportingmember receiving said exterior threads on said adjusting member, saidsupporting member being secured to the said lateral extension of saidshell, said conductive shell having a second perforated end, a secondcup-shaped member enclosing said second perforated end and secured tosaid lateral extension of said shell, said second cup-shaped member alsohaving a flat, flexible bottom, having a perforated portion adjacentsaid second perforated end of the hollow conductive shell, an integrallysecured circular flange surrounding the perforated portion of the bottomof said second cupshaped member and extending outwardly, a closed endfor said last mentioned circular flange adapted to act as an anode, andmeans for adjusting the spacing between the perforations in said secondcup-shaped member and the second perforated end of said first mentionedhollow tube.

3. An ultra-high frequency discharge device comprising a hollowconductive shell having a perforated end, said shell having an extensionlateral to said perforated end; a cup-shaped member enclosing theperforated end of said conductive shell and having its edge secured tosaid lateral extension of said shell, the bottom portion of thecup-shaped member being flat, flexible and having a perforated portionadjacent the perforated end of the hollow conductive shell, anintegrally secured circular flange surrounding the perforated portion ofsaid cup-shaped member and extending outwardly, insulation closing theend of said circular flange, a cathode within said circular flange, saidcircular flange having exterior screw threads, an adjusting memberscrewed on said threads and having threads on its exterior, a supportingmember receiving said exterior threads on said adjusting member, saidsupporting member being secured to the said lateral extension of saidshell, said conductive shell having a second perforated end, a secondcup-shaped member enclosing said second perforated end and secured tosaid lateral extension of said shell, said second cup-shaped member alsohaving a flat, flexible bottom, having a perforated portion adjacentsaid second perforated end of the hollow conductive shell, an integrallysecured circular flange surrounding the perforated portion of the bottomof said second cupshaped member and extending outwardly, a closed endfor said last mentioned circular flange adapted to act as an anode, andmeans for adjusting the spacing between the perforations in.

said second cup-shaped member and the second perforated end of saidfirst mentioned hollow tube, said last mentioned means including acylindrical member having' screw threads on its inner surface ofdifferent pitch than the screw threads on-its outer surface.

4. An ultra-high frequency discharge device comprising a hollowconductive shell having a perforated end, said shell having an extensionlateral to said perforated end; a cup-shaped member enclosing theperforated end of said conductive shell and having its edge secured tosaid lateral extension of said shell, the bottom portion of thecup-shaped member being flat, flexible and having a perforated portionadjacent the lperforated end of the hollow conductive shell, anintegrally secured circular flange surrounding the perforated portion ofsaid cup-shaped member and extending outwardly, insulation closing theend of said circular flange, a cathode within said circular flange, saidcircular flange having exterior screw threads,

an adjusting member screwed on said threads and having threads on itsexterior, a supporting member receiving said exterior threads on saidadjusting member, said supporting member being secured to the saidlateral extension of said shell, said hollow tube having a secondperforated end, a second cup-shaped member enclos ing said secondperforated end'and secured to said lateral extension of said shell, saidsecond cup-shaped member also having a flat, flexible bottom, having aperforated portion adjacent said second perforated end of the hollowtube, an integrally secured circular flangesurrounding the perforatedportion of the bottom of said second cup-shaped member and extendingoutwardly, a closed end for said last mentioned circularange adapted toact as an anode, and means for adjusting the spacing between theperforations in said second cup-shaped member and the second perforatedend of said rst mentioned hollow tube, said last mentioned meansincluding a cylindrical member having screw threads on its inner surfaceof different direction than the screw threads on its outer surface.

ILIA E. MOUROMTSEFF. GEORGE M. DINNICK.

